Thin backlight for LCD displays through use of field-induced polymer electro luminescence panels

ABSTRACT

A FIPEL device used as an illuminating part for a display.

BACKGROUND

Current LCD display panels require that light be directed through theedge lit panel reflecting off of the back surface of the panel andemitted out of the front surface of the panel. The LCD panel itself isformed of a matrix of very small, referred to as pixel, openings alsoreferred to as LCD gates. When a gate is switched open, light passesthrough until the gate is switched off. In color displays, each pixel iscomposed of three sub pixels which are Red, Blue, and Green. When allthree sub pixels are switched on, the three colors appear to be emittedfrom the same point and the eye sees white light. When the sub pixelsare switched on and off for various time periods the light emitted fromthe three sub pixels appears as various colors.

Edge lit back light systems are composed of one or more light guides asshown in prior art FIGS. 1 and 12 of U.S. Pat. No. 7,963,687, to furtherdirect the light from the light guide(s) and diffuse the light before itis allowed to enter the LCD panel. If the light is not diffused,distortions in the light, called pattering, would appear making thelight output of the LCD panel distorted and unsightly.

Edge lit back light assemblies may also have air gaps between the LEDemitters and the surface of the light guide that receives the light. Theair gap is intended to allow the emitted light to spread and mix priorto entering the light guide structure. The light guides are typicallycomposed of one or more plastic like panels selected for their specificlight transmissive and reflective properties. These panels willtypically have reflective films or materials on all of the edges withthe exception of the portion of the edge where light is emitted into thepanel to ensure that as much light as possible is available to beemitted out of the front of the panel toward the LCD display panel.

The back surface of an edge lit LED panel light guide is designed suchthat the guide panel emits light in one direction only, from the backsurface of the panel to the front surface of the panel where it isemitted. The back surface of the panel, prior art FIGS. 3 and 5 fromU.S. Pat. No. 7,963,687, will typically be reflective or containstructures that reflect and redirect light to the front surface of thelight guide panel. Those light guides with reflective back surfaces maybe made so by any of a number of means including plated coatings andreflective films. Light guides lacking a plated or reflective film onthe back surface may have reflective structures, '687 FIGS. 4A through4D, pressed or molded into the back surface. These structures may becomprised of prisms and or lens as shown in the prior art figures. Lightguides lacking a reflective back surface or a back surface withreflective structures may have an additional sheet of reflectivestructures adhered around it's perimeter with an air gap between thesheet and the back surface of the light guide. These sheets ofreflective structures are typically prisms and or lens as shown in theprior art figures.

Diffuser panels, prior art FIG. 3 reference 27, are placed between thelight guide assembly and the back surface of the LCD panel. Lightemitted from the front surface of the light guide assembly will havesome patterning regardless of the reflective films, prisms and lens andother films and structures to minimize light patterning. A diffuser isused to further blend the light from the light guide into a uniform beambefore the light enters the LCD panel. So as to ensure a homogenousbeam, an air gap is generally present between the front surface of thediffuser and a polarizer sheet or film and the back surface of the LCDarray panel. The air gap between the diffuser and the polarizer sheetgives the light leaving the diffuser a better opportunity to mixresulting in an attenuation of any remaining pattering.

Polarizers

The last part of a backlight assembly is a polarizer sheet. Thepolarizer is composed of one or more films that contain very specificpolarization properties. LCD panels are composed of LCD light gateswhere the gate material is a polarized element. If the light enteringthe gate is not polarized, some of the light will be attenuated becauseit will not be in phase with the polarized LCD pixel gate. If the lightentering the gate is polarized, then the light entering the LCD gatewill be less attenuated. In order to ensure that light entering the LCDpanel from the diffuser is polarized, a polarizer film(s) is placedbetween the front surface of the diffuser and the back surface of theLCD array panel. An air gap will generally be present between theemitting surface of the diffuser and the polarized film.

SUMMARY

The present application describes display systems that allow for verythin back lighting panels that negate the disadvantages of edge lit anddirect LED backlighting panels. The present invention results inbacklighting panels that do not need light guides, diffusers and airgaps to provide even and homogenous light to the back of a LCD arraypanel.

BRIEF DESCRIPTION OF THE DRAWINGS

In the Drawings:

FIG. 1 shows a depiction of an asymmetrical (single dielectric layer)FIPEL light emitting device which emits light only from its frontsurface;

FIG. 2 shows a depiction of an asymmetrical (single dielectric layer)FIPEL light emitting device which emits light from its front and backsurfaces;

FIG. 3 shows a depiction of a symmetrical (dual dielectric layers) FIPELlight emitting device which emits light only from its front surface;

FIG. 4 shows a depiction of a symmetrical (dual dielectric layers) FIPELlight emitting device which emits light from its front and backsurfaces;

FIG. 5 shows a depiction of a typical edge lit LED backlighting systemshowing all of the components and a depiction of the assembly of a LCDarray panel;

FIGS. 6 and 7 show embodiments using the FIPEL light emitting device.

DETAILED DESCRIPTION

The present invention describes using a Field-Induced PolymerElectro-Luminescence (FIPEL) technology to form a display. FIPEL wasdeveloped as an area lighting device that produces larger quantities oflight for a given size panel than previous electro-luminescence (EL)panels which are well known in the art. FIPEL panels operate onalternating current. The frequency of the current is higher than 60 or50 Hz normally used to power EL panels.

Embodiments describe replacing LED Edge Lit backlight panels for LCDdisplays. These displays are used for televisions, desktop and laptopcomputer displays, tablet computers, appliance and consumer electronicsdevices, PDAs, mobile devices such as cell phones and wired and wirelesstelephones, PDAs, instrument displays for vehicles and various testequipment devices, large commercial display such as stadium displays,add on lightings such as television back directed lighting and bezellighting, and other various lighting through LCD display panels.

FIPEL panels are simple and inexpensive to construct.

FIGS. 1-2 illustrate single dielectric FIPEL devices and FIGS. 3-4illustrate dual dielectric FIPEL devices. The differences between thetwo groups deal with the direction of emitted light. The basicconstruction of FIPEL devices is discussed in the following.

Lab quality FIPEL devices are generally fabricated on glass substrateswith various coatings such as aluminum and Indium tin oxide (ITO). ITOis a widely used transparent conducting oxide because of its electricalconductivity and optical transparency, as well as the ease with which itcan be deposited as a thin film. Because of this, ITO is used forconducting traces on the substrates on many LCD display screens. As withall transparent conducting films, a compromise must be made betweenconductivity and transparency, since increasing the thickness andincreasing the concentration of charge carriers will increase thematerial's conductivity, but decrease its transparency. The ITO coatingused for the device discussed here is approximately 100 nm in thickness.In the figures, the ITO coated glass substrates are identified by thereference number 4A throughout.

The other substrate, assembly 1, is aluminum (Al) deposited on a glasssubstrate. The resulting thickness of the Al deposition is sufficient tobe optically opaque. The Al deposit on the glass substrate acts as anelectrode and reflector to ensure light from the emissive layer 3 isdirected through the ITO substrate layer 4A for devices illustrated inFIGS. 1 and 3.

Each device includes a dielectric layer identified by the referencenumber 2 throughout. The dielectric layer is deposed on the oppositeside of the top substrate layer of either Al in the FIGS. 1 and 3embodiment, or in the ITO layer in the FIGS. 2 and 4 embodiment.

The dielectric layer 2 is composed of a copolymer of P(VDF-TrFE)(51/49%). The dielectric layer is generally spin coated against theglass side of the top layer (insulated side) and the ITO (conductive)side of the bottom glass substrate. In all cases the dielectric layer isapproximately 1,200 nm thick, but different embodiments can havedifferent thicknesses.

The emissive layer (reference number 3 throughout) is composed of a mixpolymer base ofpoly(N-vinylcarbazole):fac-tris(2-phenylpyridine)iridium(III)[PVK:Ir(ppy)3] with Medium Walled Nano Tubes (MWNT). The emissive layercoating is laid onto the dielectric layer 2 to a depth of approximately200 nm. According to tests, the greatest light output the concentrationof MWNTs to the polymer mix is approximately 0.04% by weight.

FIGS. 1 and 2 are embodiments of asymmetrical devices, where the stackincludes dielectric 2 on only one side of the emissive layer 3. FIGS. 3and 4 are embodiments of symmetrical devices where the stack includesdielectrics 2 on both sides of the emissive layer 3.

When an alternating current provided by signal generator 5 is appliedacross the devices shown in FIGS. 1 and 2 (asymmetrical devices) and 3and 4 (symmetrical devices), the emissive layer emits light at specificwavelengths depending on the frequency of the alternating current. Thealternating current is applied across the conductive side of the toplayer (reference number 4B) and the conductive side of the bottom layer(reference number 4A). Light emission comes from the injection ofelectrons and holes into the emissive layer. Holes follow the PVK pathsin the mixed emissive polymer and electrons follow the MWNTs paths.Signal generator 5 may be fixed, as to the frequency it provides to aFIPEL device or it may be control by a computer where the frequency isdetermined based on algorithms and data contained within content thatwill be displayed.

Carriers within the emissive layer then recombine to form excitons,which are a bound state of an electron and hole that are attracted toeach other by the electrostatic force or field in the PVK host polymer,and are subsequently transferred to the Ir(ppy)3 guest, leading to thelight emission.

Modern LCD digital televisions have undergone an evolution of back lightsystems starting with Cold Cathode Florescence Light sources, to LEDscanning edge lit systems to non-scanning LED edge lit systems. LED EdgeLit backlights are formed of one or more panels that function as lightguides or light pipes in that they control the direction of lightemitted into the light guide panel and change the light direction suchthat it is emitted out the front of the light guide.

An edge lit LED backlight system 20 generally has one or more LEDs asshown in FIG. 5. In this depiction of an edge lit backlight system, notethat object 21 is a support structure to which the components arefastened. The fastening devices for the panel are not shown in thisdepiction for the sake of clarity. Component 22 is a clear plastic panelsuch as polycarbonate. A LED backlight system may be formed of severalnarrow panels or a single panel that is the size of the LCD panelassembly 26-27-28.

An LED 24 is shown at the edge of the panel with a reflector cone. Anair gap separating the LED from panel 22. Panel 22 will generally havesome reflective surface, such as a reflective tape (not shown), attachedto all of the edges except for that area in front of LED 24 which is thearea covered by the air gap. An air gap is used between the LED and theedge of panel 22 to allow more emitted light to enter panel 22.

Panel 22 will also generally have a reflective back surface 23 toredirect light attempting to exit panel 22 at the back of the panel. Thereflective surface is depicted as object 23. Object 23 may be areflective film or a reflective panel with microlens and/or reflectivestructures such as lenses and prisms molded into its back surface. Microlens and micro prisms are well known in the art for reflecting anddirecting scattered light in a known direction. Object 23 improves theefficiency of light guide panel 22 to emit light toward object 25 whichis a diffuser panel.

Light being emitted by light guide panel 22 may have distortions such asring, lines or bands of brighter and darker light due to light beingscattered in patterns in light guide 22. Diffuser 25 scatters lightentering the surface between light 24 and diffuser 25. Note also that anair gap may be present between light guide 22 and diffuser 25 to furtherallow light emitted from light guide 22 more of an opportunity to mixand soften edges of light patterns.

Diffuser 25 scatters the light into multiple directions further mixingit into a homogenous beam that is emitted out of the opposite surface ofdiffuser 25 toward the LCD panel assembly 26-27-28.

The LCD panel is made up of LCD gates which represent the pixels on aLCD display panel. Each pixel is further composed of three sub-pixels. Acolorizer film 27 is placed on the back of LCD panels. The area of thecolorizer film 27 that resides behind each pixel will be colored eitherred, blue or green so that white light from the back light system thatenters the sub-pixel will be colored. This innovation reduces the numberof LEDs needed to provide light from the back light system. In the pastbacklights contained red, blue and green LEDs that were strobed in atime sequential manner so that LCD gates had to be turned on and offthree times as often as they are with sub-pixels receiving colored lightsimultaneously through the color filter film.

LCD gates that make up the LCD panel are able to pass or not pass lightbased on a strand of polarized material in the gate that is rotated whena charge is placed across the individual gate. So as to pass a maximumamount of light through the gate, the light entering needs to bepolarized to the same polarity as the gate. Element 26 of LCD panel26-27-28 is a polarization film that ensures that light entering LCDpanel 26-27-28 is properly polarized.

As light leaving or being emitted from the LCD gates is still polarized,second polarization film, also referenced as 26, is placed on the frontof the LCD panel. This polarization film cleans up any scattering oflight leaving the front of the LCD gates and improves the viewing angleof the display panel.

The inventor recognizes that FIPEL light emitting panels provide theopportunity to replace LED edge lit back lighting systems with a lowercost and lower parts count device. The typical LED edge lit backlightassembly as shown in FIG. 5 has a light guide/pipe, an array of LEDsmounted to one of the edges of the assembly, a back reflector object 23to redirect scattered light back through the light guide 22, a diffuser25 to blend the light from the light guide 22 and two air gaps shown as29 and 30.

A first FIPEL backlight system as shown in FIG. 6 is formed of a FIPELmodule 31, which emits light directly from its transparent surface. TheFIPEL module can be any of the modules shown in FIGS. 1 and 3. The FIPELmodules need no reflective sheet or device module at their back toredirect scattered light. FIPEL modules do not need reflective devicesaround the edges of the module to redirect light that would otherwiseemit from the edges as does the LED edge lit backlight system. There isno LED array needed to inject light into the module. FIPEL module 31emits light only in one direction evenly from its flat emission surface.The emitted light contains no distortion pattern, so a diffuser panel 25is not necessary nor are the air gaps 29 and 30, normally found on eachside of the diffuser as shown in FIG. 6.

In Total the FIPEL panel contains one component. The typical LED edgelit backlight assembly has 6 components including the two air gaps andthe additional supporting structure (not shown) required for the airgaps.

FIPEL panel 31 is shown mounted directly to the polarizer film 26, colorfilm 27 and LCD panel 28. This further decreases the parts count forsupporting structures.

A further refinement of FIPEL backlight systems is shown in FIG. 7. Inthis embodiment, the first polarization film 26 is attached to theemitting surface of FIPEL device 4A of FIG. 5. The polarization film 26is part of the FIPEL device manufacturing process and become anotherpart of the basic assembly. The addition of polarization film 26 to theFIPEL device makes assembly of the LCD panel simpler with only the colorfilm to be aligned and bonded to the LCD panel.

A further refinement of FIPEL backlight systems includes the 4Asubstrate plated with ITO on the side facing the PVK layer 3 polarizedon the emissive or front side facing the color film between the LCDpanel and the FIPEL device. This refinement results in the eliminationof another component, specifically the first polarizer file sheet 26.

Both of the FIPEL devices 31 and 32 shown in FIGS. 6 and 7 aresubstantially thinner than a LED edge lit backlight assembly. If weassume that the two glass substrates are 0.020 each in thickness and theAl coating is approximately 100 nm, the dielectric layer isapproximately 1,200 nm, the emission layer is approximately 200 nm andthe ITO layer is approximately 100 nm. The total resulting thickness isapproximately 0.040 inch, more specifically, less than 0.1 inches thick.

LED edge lit assemblies, depending on the reflector sheet behind thelight guide can approach 0.250 inch which is some six times thicker thanthe FIPEL device of an embodiment.

The differences between the two technologies can allow for the FIPELdevice/module to be mounted directly to the back surface of the LCDpanel. This simplifies the manufacturing process (less manual touchingof the panel) and allows for the plastic back of the display screen tobecome the supporting device with less or no metal resulting in a weightsavings and a substantially thinner product.

This can also be used with the new Samsung screen technology calledElectrowetting Displays which may have backlights or have only havereflective back surfaces that reflect ambient light. A FIPEL panel ofthe type shown in FIG. 5 can provide both. When the FIPEL panel isactive with this type of display, the display is using a backlight inlow ambient light environments. When the FIPEL panel is turned off, thereflective back surface of the FIPEL panel is reflective allowing thedisplay to be used in high light environments. This gives theElectrowetting Display the best of both worlds.

Although only a few embodiments have been disclosed in detail above,other embodiments are possible and the inventors intend these to beencompassed within this specification. The specification describesspecific examples to accomplish a more general goal that may beaccomplished in another way. This disclosure is intended to beexemplary, and the claims are intended to cover any modification oralternative which might be predictable to a person having ordinary skillin the art. For example, other sizes and thicknesses can be used.

Those of skill would further appreciate that the various illustrativelogical blocks, modules, circuits, and algorithm steps described inconnection with the embodiments disclosed herein may be implemented aselectronic hardware, computer software, or combinations of both. Toclearly illustrate this interchangeability of hardware and software,various illustrative components, blocks, modules, circuits, and stepshave been described above generally in terms of their functionality.Whether such functionality is implemented as hardware or softwaredepends upon the particular application and design constraints imposedon the overall system. Skilled artisans may implement the describedfunctionality in varying ways for each particular application, but suchimplementation decisions should not be interpreted as causing adeparture from the scope of the exemplary embodiments.

The various illustrative logical blocks, modules, and circuits describedin connection with the embodiments disclosed herein, may be implementedor performed with a general purpose processor, a Digital SignalProcessor (DSP), an Application Specific Integrated Circuit (ASIC), aField Programmable Gate Array (FPGA) or other programmable logic device,discrete gate or transistor logic, discrete hardware components, or anycombination thereof designed to perform the functions described herein.A general purpose processor may be a microprocessor, but in thealternative, the processor may be any conventional processor,controller, microcontroller, or state machine. The processor can be partof a computer system that also has a user interface port thatcommunicates with a user interface, and which receives commands enteredby a user, has at least one memory (e.g., hard drive or other comparablestorage, and random access memory) that stores electronic informationincluding a program that operates under control of the processor andwith communication via the user interface port, and a video output thatproduces its output via any kind of video output format, e.g., VGA, DVI,HDMI, displayport, or any other form. This may include laptop or desktopcomputers, and may also include portable computers, including cellphones, tablets such as the IPAD™, and all other kinds of computers andcomputing platforms.

A processor may also be implemented as a combination of computingdevices, e.g., a combination of a DSP and a microprocessor, a pluralityof microprocessors, one or more microprocessors in conjunction with aDSP core, or any other such configuration. These devices may also beused to select values for devices as described herein.

The steps of a method or algorithm described in connection with theembodiments disclosed herein may be embodied directly in hardware, in asoftware module executed by a processor, using cloud computing, or incombinations. A software module may reside in Random Access Memory(RAM), flash memory, Read Only Memory (ROM), Electrically ProgrammableROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), registers,hard disk, a removable disk, a CD-ROM, or any other form of tangiblestorage medium that stores tangible, non transitory computer basedinstructions. An exemplary storage medium is coupled to the processorsuch that the processor can read information from, and write informationto, the storage medium. In the alternative, the storage medium may beintegral to the processor. The processor and the storage medium mayreside in reconfigurable logic of any type.

In one or more exemplary embodiments, the functions described may beimplemented in hardware, software, firmware, or any combination thereof.If implemented in software, the functions may be stored on ortransmitted over as one or more instructions or code on acomputer-readable medium. Computer-readable media includes both computerstorage media and communication media including any medium thatfacilitates transfer of a computer program from one place to another. Astorage media may be any available media that can be accessed by acomputer. By way of example, and not limitation, such computer-readablemedia can comprise RAM, ROM, EEPROM, CD-ROM or other optical diskstorage, magnetic disk storage or other magnetic storage devices, or anyother medium that can be used to carry or store desired program code inthe form of instructions or data structures and that can be accessed bya computer.

The memory storage can also be rotating magnetic hard disk drives,optical disk drives, or flash memory based storage drives or other suchsolid state, magnetic, or optical storage devices. Also, any connectionis properly termed a computer-readable medium. For example, if thesoftware is transmitted from a website, server, or other remote sourceusing a coaxial cable, fiber optic cable, twisted pair, digitalsubscriber line (DSL), or wireless technologies such as infrared, radio,and microwave, then the coaxial cable, fiber optic cable, twisted pair,DSL, or wireless technologies such as infrared, radio, and microwave areincluded in the definition of medium. Disk and disc, as used herein,includes compact disc (CD), laser disc, optical disc, digital versatiledisc (DVD), floppy disk and blu-ray disc where disks usually reproducedata magnetically, while discs reproduce data optically with lasers.Combinations of the above should also be included within the scope ofcomputer-readable media. The computer readable media can be an articlecomprising a machine-readable non-transitory tangible medium embodyinginformation indicative of instructions that when performed by one ormore machines result in computer implemented operations comprising theactions described throughout this specification.

Operations as described herein can be carried out on or over a website.The website can be operated on a server computer, or operated locally,e.g., by being downloaded to the client computer, or operated via aserver farm. The website can be accessed over a mobile phone or a PDA,or on any other client. The website can use HTML code in any form, e.g.,MHTML, or XML, and via any form such as cascading style sheets (“CSS”)or other.

Also, the inventor(s) intend that only those claims which use the words“means for” are intended to be interpreted under 35 USC 112, sixthparagraph. Moreover, no limitations from the specification are intendedto be read into any claims, unless those limitations are expresslyincluded in the claims. The computers described herein may be any kindof computer, either general purpose, or some specific purpose computersuch as a workstation. The programs may be written in C, or Java, Brewor any other programming language. The programs may be resident on astorage medium, e.g., magnetic or optical, e.g. the computer hard drive,a removable disk or media such as a memory stick or SD media, or otherremovable medium. The programs may also be run over a network, forexample, with a server or other machine sending signals to the localmachine, which allows the local machine to carry out the operationsdescribed herein.

Where a specific numerical value is mentioned herein, it should beconsidered that the value may be increased or decreased by 20%, whilestill staying within the teachings of the present application, unlesssome different range is specifically mentioned. Where a specifiedlogical sense is used, the opposite logical sense is also intended to beencompassed.

The previous description of the disclosed exemplary embodiments isprovided to enable any person skilled in the art to make or use thepresent invention. Various modifications to these exemplary embodimentswill be readily apparent to those skilled in the art, and the genericprinciples defined herein may be applied to other embodiments withoutdeparting from the spirit or scope of the invention. Thus, the presentinvention is not intended to be limited to the embodiments shown hereinbut is to be accorded the widest scope consistent with the principlesand novel features disclosed herein.

What is claimed is:
 1. A display system, comprising an emissive body,formed of a first substrate having a first conductive thin film, adielectric layer formed directly on said first substrate, an emissivelayer, formed directly on the dielectric layer, said emissive layer hasmixed polymer and a second substrate having a second conductive thinfilm thereon, formed on a said emissive layer, said emissive body havinga flat light emitting surface, said emissive body emitting lightcontinuously and evenly from a whole area of the flat light emittingsurface, and said emissive body emitting light continuously and evenlyover a whole area of light incident surface of a pixel controllabledevice, said pixel controllable device, having a polarizer filmconnected directly to the light emitting surface without an air gap, acolor film connected to a polarizer film without an air gap, and a pixelcontrollable panel connected to the color film without an air gap; and asignal generator, outputting an alternating current between said firstconductive thin film and said second conductive thin film, to cause theemissive layer to emit light at specific wavelengths depending on thefrequency of alternating current.
 2. The display system as in claim 1,wherein said emissive body has a thickness less than 0.1 inch over thearea.
 3. The display system as in claim 1, wherein said emissive bodyemits light from both a front and a back of the area.
 4. The displaysystem as in claim 1, wherein the display system has a front shell and arear shell.
 5. The display system as in claim 4, wherein the rear shellis formed of a non-reflective material.
 6. The display system as inclaim 1, wherein said pixel controllable device is a liquid crystaldevice or an electrowetted device.
 7. The display system as in claim 1,wherein the display system is a television.
 8. This display system as inclaim 6, wherein the display system is in a portable computer.
 9. Thedisplay system as in claim 8, wherein said portable computer is one of atablet, cell phone, PDA.
 10. The display system as in claim 1, whereinsaid pixel controllable device having a TFT, or said pixel controllabledevice is operated in VA mode or IPS mode.
 11. The display system as inclaim 1, wherein said emissive body has a non-symmetrical stack ofmaterials from its top to its bottom.
 12. The display system as in claim1, wherein said emissive body has a symmetrical stack of materials fromits top to its bottom.
 13. The display system as in claim 1, furthercomprising a connection to a computer that creates an output signal thatsets said frequency of the alternating current.
 14. The display systemas in claim 1, wherein said first and second substrates are glasssubstrates.
 15. The display system as in claim 1, wherein said emissivelayer is a mix of poly(N-vinylcarbazole):fac-tris(2-phenylpyri-dine)iridium(III) with NanoTubes therein.
 16. The display system as in claim 15, wherein aconcentration of Nano Tubes to the polymer mix is approximately 0.04% byweight.
 17. A display system, comprising a housing, having a rear part,and a front part, having an area for a display in said front part; anemissive body having a flat light emitting surface, and said emissiveboy emitting light continuously and evenly from a whole area of the flatlight emitting surface, and emissive body emitting light continuouslyand evenly over a whole are of a light incident surface of a pixelcontrollable device, and said emissive body attached directly againstsaid rear part of said housing, said emissive body, formed of asubstrate having a first conductive thin film, a dielectric layer formeddirectly on said first substrate, an emissive layer, formed directly onthe dielectric layer, said emissive layer has a mixed polymer and asecond substrate having a second conductive thin film thereon, formed onsaid emissive layer; said pixel controllable device, having a polarizerfilm connected directly to the light emitting surface without an airgap, color film connected to the polarizer film without an air gap, anda pixel controllable panel connected to the color film without an airgap; and a signal generator, outputting an alternating current betweensaid conductive thin film and said second conductive thin film, to causethe emissive layer to emit light at specific wavelengths depending onthe frequency of the alternating current.
 18. The display system as inclaim 17, wherein said emissive body has a thickness less than 0.1 inchover the area.
 19. The display system as in claim 17, wherein saidemissive body emits light from both front and back of the display. 20.The display system as in claim 17, wherein the rear part is formed of anon-reflective material.
 21. The display system as in claim 17, whereinsaid pixel controllable device is a liquid crystal device or anelectrowetted device.
 22. The display system as in claim 17, wherein thedisplay system is a television.
 23. The display system as in claim 17,wherein the display system is in a portable computer.
 24. The displaysystem as in claim 23, wherein said portable computer is one of atablet, cell phone, PDA.
 25. The display system as in claim 17, whereinsaid pixel controllable device having a TFT, or said pixel controllabledevice is operated in VA mode or in IPS mode.
 26. The display system asin claim 17, wherein said emissive body has a non-symmetrical stack ofmaterials from its top to its bottom.
 27. The display system as in claim17, wherein said emissive body has a symmetrical stack of materials fromits top to its bottom.
 28. The display system as in claim 17, furthercomprising a connection to a computer that creates an output signal thatsets said frequency of the alternating current.
 29. The display systemas in claim 17, wherein said first and second substrates are glasssubstrates.
 30. The display system as in claim 17, wherein said emissivelayer is a mix of poly(N-vinylcarbazole):fac-tris(2-phenylpyri-dine)iridium(III) with NanoTubes therein.
 31. The display system as in claim 30, wherein aconcentration of nanotubes Nano Tubes to the polymer mix isapproximately 0.04% by weight.